The clock genes (PER2, CLOCK1, CRY1, and ARNTL[BMAL1]) exhibited similar daily fluctuations in phase and amplitude between a group transplanted with adipose-derived mesenchymal stem cells derived from a healthy individual (N-ADSC) and a group transplanted with T2DM-ADSC. The gene discussed is CLOCK; the disease is type 2 diabetes mellitus.